CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 15 - MCQExams.com

• Facilitated transport is the process of spontaneous passive transport or downhill transport of molecules or ions across a biological membrane via specific transmembrane integral proteins. 
• The movement of molecules or ions is from a region of lower concentration to a region of higher concentration is uphill transport.

Correct option:(D)

Explanation for correct option: (D)

• Respiration is a catabolic process used to release energy from food.
• In respiration food is oxidised into simpler products like carbon dioxide, water and energy is released in the form of ATP.
  Respiration is defined as the movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction.
  

A.Correct option B

B.Explanation for correct option:

• Osmosis is the movement of solvent molecules through a semi-permeable membrane from a region of low solute concentration to a region of higher solute concentration. 
• It does not require energy for movement and thus is the passive type of movement.

$$\textbf{Correct Option A}$$ 

$$\textbf{Solution}$$

$$\bullet$$Diffusion is the process in which molecules of a substance moves through a semipermeable membrane from a region of higher concentration to a region of lower concentration.

• Solute concentration is higher inside the cell as compared to that in the distilled water i.e., distilled water is hypotonic and the cell's interior is hypertonic.
• Water will move from outside to the inside of the cell through the semi-permeable cell membrane and will cause the cell to swell. 

$$\textbf{Correct Option D}$$

$$\textbf{Solution}$$

$$\bullet$$ In simple A, the elodea cells are mounted with five drops of 10% NaCl solution.

• The process in which there is the exudation of water in the form of droplets is known as guttation. 
• There is a loss of water in the water drops. This is the phenomenon that is found in humid and cold environments especially during the night. There are special glands called as hydathodes.
• These are responsible for the guttation. These are called as chalk glands because calcium salts are deposited on these glands.
• The process of transpiration is the loss of water in the form of water vapor.

Root exudates function in below ground plant defence. Plant roots are constantly exposed to a variety of natural enemies, including pathogenic microorganisms and root-feeding arthropods. These organisms inhabit the soil surrounding the root system, which is designated the rhizosphere. 

Chemicals secreted into the soil by roots are referred to as root exudates. By doing this root changes the chemical and physical property of soil and inhibit the growth of other plant species. Root pressure can be demonstrated by means of exudation or bleeding caused due to root pathogens.

so the correct answer is 'Exudation'.

$$\textbf{Correct Option A}$$

$$\textbf{Solution}$$

$$\bullet$$ Water potential is the measure of the tendency of the water to move from one area to other.
In the form of equation, what is the difference between the free energy of water molecules in pure water and the free energy of water molecules in the solution.
It can be measured by the formula
ψ = ψs + ψp
In which
ψs = solute potential
ψp = pressure potential
ψ = water potential.

$$\textbf{Solution A}$$

ψs = -30 bars

ψp  = 5 bars   

ψ = ψs + ψp = -30 + 5 = -25 bars. 

$$\textbf{Solution B}$$

ψs = -10 bars,

ψp = 0 bars

ψ = ψs + ψp = -10 + 0 = -10 bars

  Therefore, Solution A Water Potential (ψ) = -25 bars,

                   Solution B Water Potential (ψ) = -10 bars,

We know that the movement of the water is from higher water potential to lower water potential.
So from the value obtained for both the solutions we can clearly observed that the water will move from solution B to solution A.
So, the correct option is A.